Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenues	$ 5,033	$ 3,778
Costs and expenses:
Cost of sales	2,675	2,251
Selling, general and administrative	3,100	3,886
Research and development	415	324
Costs and Expenses, Total	6,190	6,461
Operating loss	(1,157)	(2,683)
Interest expense	(4)	(3)
Interest income	1	11
Other income, net	1,558	226
Income (loss) before income taxes	398	(2,449)
Income tax expense		(118)
Net income (loss)	$ 398	$ (2,567)
Basic net income (loss) per common share (in dollars per share)	$ 0.01	$ (0.10)
Diluted net income (loss) per common share (in dollars per share)	$ 0.01	$ (0.10)
Weighted-average number of common shares outstanding:
Basic (in shares)	27,510,000	24,597,000
Diluted (in shares)	27,737,000	24,597,000